Most western Believers will disagree with what I'm about to say due to their intellectual pride, secular humanism and lack of spirituality. We know biblical principles, promises and prophesies. But many of us do not understand how to apply these things to navigate in the realm of the spirit. Whereas in some cultures there's hyper-spirituality which negates the efficacy of one's power, authority and the reality of the dimensions and degrees of self-determination delegated to humanity. There must be a balance! Somewhere between irrational superstition and intellectual humanism lies metaphysical reality. With this understanding may I say to you in love with all sincerity that Believers can be cursed! The teaching that a Believer cannot be cursed is a lie. It's erroneous. It's false.
The classic indication of a curse is a pattern. These patterns seemingly veto one's prayer life. They seemingly veto spiritual activities. These patterns will continue until that which set the ripple effect into motion is addressed. That which set the ripple effect in motion could've occurred many generations before one's birth. That which set the pattern in motion is an abomination which defiled time, land, community (bloodline and other familial-like relationships), birthright or offices (in career, business and/or ministry).
Being cursed has nothing to do with salvation. One can be saved, indwelled with God's Spirit, infilled with God's Spirit, bear fruit of the Spirit, operate in the gifts of the Spirit, live Holy, be heaven bound AND see these negative patterns manifest.
Examples of these patterns that are seen in individuals, families, nations, territories, regions, etc. are barrenness (in any form), premature death (in any form), patterns of divorce in a family, addictions, generational poverty, generation after generation born outside of wedlock, useless men while the women dominate and excel, extended periods of joblessness, chronic sicknesses and disease, etc. ANY pattern that is not an indication of the blessings of God is an indication of a CURSE!
If you dont believe a Christian can be cursed consider this. It's foolishness to continue doing the same thing expecting different results- right? You accepted Jesus. You're fasting, praying, living holy, doing all you know to be the right thing. And yet you STILL see negative patterns in your life, family or community. Do you believe that God is wicked an unjust to allow these patterns without just cause? God is Righteous. God is Just. God honors God's word even about God's name. Somehow, somewhere someone connected to you in some way has violated the word, will and ways of God.
Will it hurt you or cost you anything to take this matter to the Lord in prayer and ask God to show you what is the root cause of that negative pattern? If I'm wrong you lose nothing- right? But if you're wrong the pattern will continue. And this could make the difference between life and death.